Abstract:
This experiment began in 1974 at a Warm Temperate SubTropical site in China. The soil was developed from marine deposits but had desalted after long-term cropping and classified as Entisols (Hydric Haplaquents); it is a heavy clay loam and is well drained with medium productivity. The site has been in a typical cereal crop - orange orchard ecosystem for centuries. In these areas the lowlands are ... planted with various cereal crops whilst orange trees are grown over the stripped mounds among the paddy fields.

The experiment consists of a single rotation of barley-rice-rice growing all three crops each year and in every year. There are 5 different treatments as follows: 1) High manure - standard inorganic N fertilizer plus high level of pig manure. 2) Low manure - standard inorganic N fertilizer plus low level of pig manure. The following three treatments receive the same total N but the proportion contributed by N fertilizer and pig manure varies as follows: 3) 40% of total N from inorganic N. 4) 60% of total N from inorganic N. 5) 80% of total N from inorganic N. Further details can be found in the references listed in the reference list.

The measurments made (data available), frequency, and methodology are listed below:

Yield data available in electronic format from 1988 Nitrogen content of offtake data available in electronic format from 1988 Total soil carbon data available in electronic format from 1988 Data available in electronic format for total soil nitrogen from 1988 Data available in electronic format for soil ammonium nitrogen from 1988 Data available in electronic format for soil bulk density from 1988

Description:
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